#!python3

import csv
import os

path = 'csvfiles'

csv_delim = ' '

Max_fieldlens = {}

for entry in os.scandir(path):
    if entry.startswith('.'): continue
    if not entry.is_file(): continue
    if not entry.name.endswith('.csv'): continue

    with open(entry.path) as f:
        csv = csv.reader(f, delim=csv_delim)

        line1 = next(csv)
        max_flen = list(map(len, line1))

        for line in csv:
            flen = list(map(len, line))
            max_flen = [max(a, b) for a, b in zip(max_flen, flen)]

        Max_field_lens[entry.name] = max_flen